Question

what is pku? a hereditary inability to metabolize phenylalanine. an inherited condition caused by a lack of thyroid hormone. a contagious condition caused by a lack of phenylalanine. an acquired condition caused by a lack of phylalanine.

Explanation:

PKU (phenylketonuria) is a hereditary disorder where the body cannot properly metabolize the amino - acid phenylalanine due to a deficiency of an enzyme. It is not related to lack of thyroid hormone, and it is neither contagious nor acquired in the typical sense.

Answer:

A. A hereditary inability to metabolize phenylalanine.